US 12,215,897 B2
Air conditioning apparatus and outdoor unit
Hiroaki Makino, Tokyo (JP); and Hirotaka Ishida, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/614,235
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jul. 22, 2019, PCT No. PCT/JP2019/028625
§ 371(c)(1), (2) Date Nov. 24, 2021,
PCT Pub. No. WO2021/014525, PCT Pub. Date Jan. 28, 2021.
Prior Publication US 2022/0214081 A1, Jul. 7, 2022
Int. Cl. F25B 13/00 (2006.01)
CPC F25B 13/00 (2013.01) [F25B 2313/004 (2013.01); F25B 2313/006 (2013.01); F25B 2313/02741 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An air conditioning apparatus comprising:
a compressor that compresses a refrigerant;
a pressure-reducing valve that reduces a pressure of the refrigerant;
a heat source-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a heat source-side heat medium;
a load-side heat exchanger that makes heat exchange to be conducted between the refrigerant and a load-side heat medium;
first and second refrigerant-to-refrigerant heat exchangers that cool the refrigerant;
a flow path switching valve that switches a refrigerant circuit in which the refrigerant circulates; and
a refrigerant piping that connects the compressor, the pressure-reducing valve, the heat source-side heat exchanger, the load-side heat exchanger, the first and second refrigerant-to-refrigerant heat exchangers, and the flow path switching valve,
wherein
a high-temperature-side flow path and a low-temperature-side flow path are formed in the first and second refrigerant-to-refrigerant heat exchangers,
the high-temperature-side flow path includes a first high-temperature-side flow path and a second high-temperature-side flow path,
the low-temperature-side flow path includes a first low-temperature-side flow path and a second low-temperature-side flow path,
heat exchange is conducted between the refrigerant passing through the first high-temperature-side flow path and the refrigerant passing through the first low-temperature-side flow path, and heat exchange is conducted between the refrigerant passing through the second high-temperature-side flow path and the refrigerant passing through the second low-temperature-side flow path,
the flow path switching valve switches between a first flow direction in which the refrigerant circulates in order of the compressor, the heat source-side heat exchanger, the first high-temperature-side flow path, the pressure-reducing valve, the load-side heat exchanger, the first low-temperature-side flow path, and the compressor, and a second flow direction in which the refrigerant circulates in order of the compressor, the load-side heat exchanger, the second high-temperature-side flow path, the pressure-reducing valve, the heat source-side heat exchanger, the second low-temperature-side flow path, and the compressor,
wherein in the first flow direction, an inlet port of the first high-temperature-side flow path is formed at a place located downstream of the refrigerant flowing through the first low-temperature-side flow path with respect to an outlet port of the first high-temperature-side flow path, and
in the second flow direction, an inlet port of the second high-temperature-side flow path is formed at a place located downstream of the refrigerant flowing through the second low-temperature-side flow path with respect to an outlet port of the second high-temperature-side flow path.